BS ISO 13821:2020,Corrugated fibreboard — Determination of edgewise crush resistance — Waxed edge method.BS ISO 13821:2020 pdf free download.
BS ISO 13821:2020 specifies a method for the determination of the edgewise crush resistance of corrugated fibreboard. The force is applied in the direction of the flute axis.
This method is applicable to single-wall (double-faced), double-wall, and triple-wall corrugated fibreboard. It may also be used to test samples taken from corrugated cases and other converted products.
While the method is applicable to waxed corrugated fibreboard, care must be taken that the heat used in the waxing step does not affect the corrugated structure. This is controlled by observing that failure during the test still occurs away from the loaded edges.
A variety of methods for the determination of edgewise crush resistance are in use in different parts of the world. These can be classified into four groups as follows:
a) Those in which a carefully cut rectangular test piece is tested without any special treatment or modification.
b) Those in which the edges of the test piece to which the force is applied are waxed to prevent the test result from being influenced by “edge effects”.
c) Those in which the test piece edges are not waxed but the shape of the test piece is such that the length is substantially reduced at a point midway between the loading edges in order to induce the failure to occur away from those edges.
d)Those in which carefully cut rectangular pieces are tested with edges clamped to prevent the test result from being influenced by “edge effects”.
The dimensions of the test piece vary from one group to the other and, in group c)， the methods vary according to the shape and method of reducing the length.
The methods may not give the same numerical results, but it can be shown that most of them can be used to predict the top-to-bottom compression strength which will be achieved when the board is properly converted into a transport package.
This document describes a method from group b) intended to be used for quality measurement and quality specification purposes.
This particular method is selected because it correlates well with the top-to-bottom compression strength of the final transport package and provides significantly higher results than unwaxed methods (a) because edge effects are avoided.
BS 13821:2020 pdf download
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